<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <meta http-equiv="X-UA-Compatible" content="ie=edge">
  <title>Document</title>
  <style>
  .box{

  }
  
  
  </style>
</head>
<body>
  <script>
  //console.log("Hello World")
  //推荐方式一：log->enter
  cosole.log("Hello World")
 //推荐方式二：react插件->clg->
 //函数
 function sayHellow(){


   
 }
  
  </script>
</body>
</html>